• Spatial Information Research
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• v.9 no.2
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• pp.309-324
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• 2001

To apply the real-time kinematic GPS surveying technique, this research has tried to obtain the TOKYO datum first from the continuous reference stations distributed all over the country. Then, analysis of the geography of a coastal area including both of land and sea has been carried out by the post-processed continuous kinematic GPS technique and the real-time kinematic GPS surveying technique. After considering the initial conditions and measuring time zone for real-time kinematic GPS, post-processed and the real-time kinematic GPS measurements have been carried out. A new system has been proposed to store measured data by using a program developed to store GPS data in real time and to monitor the satellite condition through controller simultaneously. The accuracy of GPS data acquired in real time was as good as that acquired by post processing. It is expected that it will be useful for the analysis of coastal geographic characteristics because DTM can be also constructed for the harbor reclamation, the dredging and the variation of soil movement in a river.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.1404-1407
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• 2007

본 논문에서는 객관식 문항을 난이도에 따라 자동으로 생성하는 방법을 고안하여, 학습자 수준에 적합하도록 다양하고 동적인 형태로 문항 제시를 할 수 있는 시스템을 제안하였다. 이를 위해서는 주어진 문장에서 형태소 분석을 통해 키워드를 추출하고, 각 키워드에 대하여 워드넷의 계층적 특성에 따라 의미가 유사한 후보 단어를 제시한다. 의미 유사 후보 단어를 제시할 때, 워드넷에서의 어휘간 유사도 측정 방법을 사용함으로써 생성된 문항의 난이도를 사용자가 원하는 수준으로 조정할 수 있도록 하였다. 단어의 의미 유사도는 동의어를 의미하는 수준 0에서 거의 유사도를 찾을 수 없는 수준 9 까지 다양하게 제시할 수 있으며, 이를 조절함으로써 문항의 전체 난이도를 조절할 수 있다. 후보 어휘들의 의미 유사도 측정을 위해서, 본 논문에서는 두 가지 방법을 사용하여 구현하였다. 첫째는 단순히 두 어휘의 워드넷 상에서의 거리만을 고려한 것이고 둘째는 두 어휘가 워드넷에서 차지하는 비중까지 추가적으로 고려한 것이다. 이러한 방법을 통하여 실제 출제자가 기존에 출제된 문제를 토대로 보다 다양한 내용과 난이도를 가진 문제 또는 문항을 보다 쉽게 출제하게 함으로써 출제에 소요되는 비용을 줄일 수 있었다.

• The Journal of the Korea Contents Association
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• v.12 no.3
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• pp.34-43
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• 2012

Determining the similarity between two strings can be applied various area such as information retrieval, spell checker and spam filtering. Similarity calculation between Korean strings based on dynamic programming methods firstly requires a definition of the similarity between phonemes. However, existing methods have a limitation that they use manually set similarity scores. In this paper, we propose a method to automatically calculate inter-phoneme similarity from a given set of variant words using a PAM-like probabilistic model. Our proposed method first finds the pairs of similar words from a given word set, and derives derivation rules from text alignment results among the similar word pairs. Then, similarity scores are calculated from the frequencies of variations between different phonemes. As an experimental result, we show an improvement of 10.1%~14.1% and 8.1%~11.8% in terms of sensitivity compared with the simple match-mismatch scoring scheme and the manually set inter-phoneme similarity scheme, respectively, with a specificity of 77.2%~80.4%.

• Journal of KIISE:Software and Applications
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• v.36 no.9
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• pp.767-776
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• 2009

A software birthmark is a set of characteristics that are extracted from a program itself to detect code theft. A dynamic API birthmark is extracted from the run-time API call sequences of a program. The dynamic Windows API birthmarks of Tamada et al. are extracted from API call sequences during the startup period of a program. Therefore. the dynamic birthmarks cannot reflect characteristics of main functions of the program. In this paper. we propose a functional unit birthmark(FDAPI) that is defined as API call sequences recorded during the execution of essential functions of a program. To find out that some functional units of a program are copied from an original program. two FDAPIs are extracted by executing the programs with the same input. The FDAPIs are compared using the semi-global alignment algorithm to compute a similarity between two programs. Programs with the same functionality are compared to show credibility of our birthmark. Binary executables that are compiled differently from the same source code are compared to prove resilience of our birthmark. The experimental result shows that our birthmark can detect module theft of software. to which the existing birthmarks of Tamada et al. cannot be applied.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.4
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• pp.758-766
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• 2003

This paper proposes a tree-based hierarchical image mosaicing system using camera and object parameters for efficient video database construction. Gray level histogram difference and average intensity difference are proposed for scene change detection of input video. Camera parameter measured by utilizing least sum of square difference and affine model, and difference image is used for similarity measure of two input images. Also, dynamic objects are searched by through macro block setting and extracted by using region splitting and 4-split detection methods. Dynamic trajectory evaluation function is used for expression of dynamic objects, and blurring is performed for construction of soft and slow mosaic image.

• Journal of Korean Society of Transportation
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• v.23 no.5 s.83
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• pp.169-176
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• 2005

This paper introduces the dynamic control of acceleration lanes at freeway-ramp junctions. The feasibility of operation with flexible length of acceleration lane was tested with most possible traffic conditions. The operational qualify was also evaluated using average speed and total thru-put at both ramp section and freeway section. A CORSIM microscopic simulation model was used to evaluate the operation quality with a variety or volume conditions and three acceleration lanes, each representing different length categories. In addition, tollgate O-D data including travel times were obtained for two sections on the Gyeong-bu Freeway where an effective merging distance has been largely reduced. Its effect was analyzed and compared to the simulation results. Finally, the effects of acceleration lane are discussed and operational improvement at junctions is presented as research findings.

• 한국IT서비스학회:학술대회논문집
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• 2009.11a
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• pp.198-201
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• 2009

오늘날 운영체계와 미들웨어는 수많은 API를 제공하고 있다. 최종 사용자들이 사용하는 응용 프로그램들은 이러한 API를 활용하여 개발되어지고 있다. 기존의 문서와 같은 형태의 API에 대한 기술은 기계가 자동적으로 처리하기 힘들며 개발자 입장에서도 API를 이해하기 위해서 책을 직접 읽고 이해해야 한다는 단점이 있다. 이를 극복하기 위하여 docgen과 같은 도구들이 있으나 결국은 개발자 관점에서는 API를 직접 숙지하여야 하며 응용 프로그램 상에서 직접 운영체계에서 제공하는 API 호출 부분을 작성하여 개발하여야 한다는 부분은 동일하다. 또한 서로 다른 다양한 운영체계에서는 형식은 다르지만 유사한 기능을 제공을 하는 API들이 있으나 개발자는 특정 운영체계의 API에 맞추어서 각각의 운용체계에 맞는 응용 프로그램을 개발하여야 하는 문제점이 있다. 본 연구에서는 API에 대한 정보에 대한 규격을 정의하고 각각의 API의 기능 및 특성에 대하여 메타 기술언어를 사용하여 기술하여 저장소에 저장해두고 실행시에 이러한 API정보를 사용하여 응용 프로그램과 동적으로 바인딩시켜서 실행시키는 체계에 대해서 논의한다. 응용 프로그램에서 사용하려고 하는 API와 운영체계에서 제공하는 API를 동적으로 결합시키는 엔진에서는 운영체계별 API의 차이에 의한 부분을 상쇄시키는 역할을 담당한다. 이러한 체계를 활용하면 동적으로 재구성 가능한 응용을 개발하는데 있어서 하부 시스템으로 활용될 수 있다. 향후 표준 API를 기술하는데 있어서도 본 연구에서 제시하는 메타 방식의 API 기술표현을 활용하면 보다 정확한 표준 규약 준수 여부를 확인할 수 있는 방법을 제공할 수 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.462-466
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• 2005

Dynamic (On-line) signature verification system consists of preprocessing, feature extraction, comparison and decision process for internal processing, and registration and verification windows for the user interface. We describe an implementation and design for an advanced dynamic signature verification system. Also, we suggest the method of feature extraction, matching algorithm, efficient user interface and an objective criteria for evaluating the performance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.8B
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• pp.691-698
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• 2003

Throughput response characteristics depending on the network bandwidth allocation need to be modeled to devise adaptive control mechanism to support QoS of the network. Thus, two models are proposed in this study. The first one is a dynamic system model and the other one is a stochastic model. The dynamic system model is developed to represent dynamic characteristics of the network and the stochastic model is developed to represent distribution of measured throughput data. An optimization technique is used for decision of proposed model's factor. The result confirms that the characteristics of proposed models are similar with actual network's characteristics.

• The KIPS Transactions:PartB
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• v.18B no.1
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• pp.11-20
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• 2011

Pictorial Structures is known as an effective method that recognizes and tracks human poses. In this paper, the upper body pose is also tracked by PS and a particle filter(PF). PF is one of dynamic programming methods. But Markov chain-based dynamic motion model which is used in dynamic programming methods such as PF, couldn't predict effectively the highly articulated upper body motions. Therefore PF often fails to track upper body pose. In this paper we propose the key pose-based proposal distribution for proper particle prediction based on the similarities between key poses and an upper body silhouette. In the experimental results we confirmed our 70.51% improved performance comparing with a conventional method.